The case for a Martian origin of the shergottites. II - Trapped and indigenous gas components in EETA 79001 glass

Details The case for a Martian origin of the shergottites. II - Trapped and indigenous gas components in EETA 79001 glass The case for a Martian origin of the shergottites. II - Trapped and indigenous gas components in EETA 79001 glass

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986e%26psl..77..149w&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 77, no. 2, March 1986, p. 149-158.

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58

Achondrites, Gas Analysis, Mars (Planet), Meteoritic Composition, Argon Isotopes, Glass, Neon Isotopes, Nitrogen Isotopes, Meteorites, Mars, Origin, Shergottites, Entrapment, Gases, Eeta79001, Glasses, Elephant Moraine Meteorites, Antarctic Meteorites, Rare Gases, Samples, Meteorite, Nitrogen, Isotopes, Composition, Abundance, Neon, Atmosphere, Comparisons, Volatiles, Crystalline Rocks, Snc Meteorites, Isotopic Ratios, Argon, Cosmic Rays, Spallation, Formation, Nakhlites, Experiments, Laboratory Studies, Ch

Scientific paper

The isotopic composition of N, Ar, Ne, and He, trapped in an uncrushed sample of the antarctic shergottite EETA 79001, was analyzed by subjecting the evacuated sample to stepped heating in the presence of 100 mtorr of oxygen. The isotopic composition of nitrogen (with the delta-N-15 value of greater than 300 percent) and the elemental ratios Ar-36/N-14 and Ar-40/N-14 were covariant along mixing lines passing through the Martian atmospheric composition. The results of this and previous analyses are consistent with a two-component nitrogen system in which about 84 ppb of trapped Martian atmospheric N is mixed in variable proportions with another, more thermally labile N component during stepped heating. The isotopic Ar-36/Ar-38 ratio of the EETA 79001 is different from that of the earth atmosphere by about 25 percent.

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